9-4 SERVICING INFORMATION
Complaint Symptom and possible causes Remedy
Engine idles poorly. 1. Valve clearance out of adjustment.
2. Poor seating of valves.
3. Defective valve guides.
4. Worn rocker arm or arm shaft.
5. Defective generator.
6. Defective CDI unit.
7. Spark plug gap too wide.
8. Defective ignition coil resulting in weak sparking.
9. Float-chamber fuel level out of adjustment in carburetor.
10. Clogged jets.
11. Defective fuel valve.
12. Improperly set pilot screw.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust or replace.
Replace.
Adjust.
Clean.
Replace.
Adjust.
Engine runs poorly in
high speed range.
1. Valve springs wakened.
2. Valve timing out of adjustment.
3. Worn cams or rocker arms.
4. Spark plug gap too narrow.
5. Defective ignition coil.
6. Float-chamber fuel level tool low.
7. Clogged air cleaner element.
8. Clogged fuel pipe, resulting in inadequate fuel supply to
carburetor.
9. Defective fuel valve.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Adjust.
Clean.
Clean and prime.
Replace.
Dirty or heavy
exhaust smoke.
1. Too much engine oil in the engine.
2. Worn piston rings or cylinder.
3. Worn valve guides.
4. Cylinder wall scored or scuffed.
5. Worn valve stems.
6. Defective stem seals.
Check with inspection window,
drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Engine lacks power. 1. Loss of valve clearance.
2. Weakened valve springs.
3. Valve timing out of adjustment.
4. Worn piston ring or cylinder.
5. Poor seating of valves.
6. Fouled spark plug.
7. Worn rocker arms or shafts.
8. Spark plug gap incorrect.
9. Clogged jets in carburetor.
10. Float-chamber fuel level out of adjustment.
11. Clogged air cleaner element.
12. Too much engine oil.
13. Sucking air around intake pipe.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Replace.
Adjust or replace.
Clean.
Adjust.
Clean.
Drain out excess oil.
Retighten or replace.
Engine overheats. 1. Heavy carbon deposit on piston crown.
2. Not enough oil in the engine.
3. Defective oil pump or clogged oil circuit.
4. Fuel level too low in float chamber.
5. Air leak from intake pipe.
6. Use of incorrect engine oil.
Clean.
Add oil.
Replace or clean.
Adjust.
Retighten or replace.
Change.
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